JP2001305348A - Peeling sheet with polarizing plate, its manufacturing method, method for peeling polarizing plate and its peeling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a peeling sheet with a polarizing plate which can be manufactured efficiently and can be used for efficient polarizing plate sticking work on the surface of a liquid crystal plate, and its manufacturing method, and to provide a method for peeling the polarizing plate which can be sued for the efficient polarizing plate sticking work on the surface of the liquid crystal plate and its peeling device. SOLUTION: After notch which reaches the upper surface of the peeling sheet from a polarized light sheet side is formed for the peeling sheet with the polarized light sheet in which an adhesive layer and a peeling sheet are layered in order on one side of the polarized light sheet having an axis of polarization in the delivery direction, a polarizing plate with the adhesive layer of a prescribed shape is prepared to obtain the peeling sheet with the polarizing plate. Besides, the peeling sheet with the polarizing plate is delivered, then the polarizing plate with the adhesive layer is peeled from the peeling sheet with the polarizing plate by a polarizing plate peeling implement whose peeling work part is placed obliquely in the delivery direction of the peeling sheet with the polarizing plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release sheet with a polarizing plate which can be used for efficient attachment to the surface of a small or ultra-small liquid crystal plate such as an LCD for a projector, a camcorder LCD, and a mobile phone LCD. The present invention relates to a method, a method for separating a polarizing plate, and an apparatus for separating the polarizing plate.

[0002]

2. Description of the Related Art Conventionally, in order to attach a polarizing plate to a small to ultra-small liquid crystal plate, a release sheet with a polarizing plate having a polarizing plate with an adhesive layer attached at an appropriate interval on the surface of the release sheet is used. hand,
A method has been employed in which a release sheet is sequentially sent out, and then the polarizing plate is peeled off from the release sheet and adhered to a liquid crystal plate surface. The release sheet with a polarizing plate used in this method is usually cut into a flat roll of a release sheet with a polarizing sheet in which an adhesive layer and a release sheet are sequentially laminated on one surface of a long polarizing sheet having a width of 600 to 1200 mm. Further, the flat plate is sequentially cut into thin pieces, and a large number of small rectangular polarizing plates having a polarizing axis in a substantially diagonal direction are prepared, a release sheet is peeled from the small polarizing plate, and a rectangular adhesive is adhered to the surface of another release sheet. The small polarizing plate with the agent layer is manufactured by manually placing one side of the small polarizing plate with one side thereof in the same direction as the feeding direction of the release sheet, and winding the roll into a roll. This is because the liquid crystal plate to which the polarizing plate is attached is provided on the release sheet with the release sheet sending direction and one side of the liquid crystal plate in the same direction, and it is necessary to match the directionality at the time of attachment. Because there is. However, this method of manufacturing a release sheet with a polarizing plate involves manually replacing the cut polarizing plate with a release sheet, and there is a problem that a release sheet with a polarizing plate cannot be efficiently manufactured.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a release sheet with a polarizing plate, which can be efficiently manufactured, and which can be used for an efficient work of attaching a polarizing plate to the surface of a liquid crystal plate, a method for manufacturing the same, and a surface of the liquid crystal plate. An object of the present invention is to provide a method for peeling a polarizing plate with a pressure-sensitive adhesive layer, which can be used for efficient work of attaching a polarizing plate to a polarizing plate, and a peeling device therefor.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that a polarizing sheet having a polarizing axis in the feeding direction has a pressure-sensitive adhesive layer and a release sheet laminated on one side in this order. The release sheet with a sheet, by making a cut from the polarizing sheet side to reach the upper surface of the release sheet, by creating a polarizing plate with an adhesive layer of a predetermined shape,
By peeling the polarizing plate with a pressure-sensitive adhesive layer from the peeling sheet with a polarizing plate, by peeling the polarizing plate with a pressure-sensitive adhesive layer, by disposing the peeling action portion of the polarizing plate peeling device obliquely to the sending direction of the peeling sheet with a polarizing plate, The inventors have found that the above problems can be solved, and have completed the present invention.

[0005] That is, the present invention provides a release sheet with a polarizing plate, characterized in that individual polarizing plates having a polarization axis in the feeding direction of the release sheet are adhered and arranged on the surface of the release sheet by an adhesive layer. Is provided. In addition, the present invention provides a release sheet with a polarizing sheet in which an adhesive layer and a release sheet are sequentially laminated on one side of a polarizing sheet having a polarization axis in a feeding direction, and a cut reaching the release sheet upper surface from the polarizing sheet side is provided. An object of the present invention is to provide a method for producing a release sheet with a polarizing plate, which comprises preparing a polarizing plate with a pressure-sensitive adhesive layer having a shape.

The present invention also provides a method for feeding the above release sheet with a polarizing plate and peeling the polarizing plate with an adhesive layer from the release sheet with a polarizing plate. The present invention provides a method for separating a polarizing plate, characterized in that the polarizing plate is separated in a direction oblique to the feeding direction of the polarizing plate. Further, the present invention has a means for feeding a release sheet with a polarizing plate, a polarizing plate release tool provided on the release sheet side of the release sheet with a polarization plate, and a means for taking off a release sheet. An object of the present invention is to provide a polarizing plate peeling device characterized in that it is arranged obliquely with respect to the feeding direction of the polarizing sheet-attached release sheet.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A release sheet with a polarizing plate of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of one embodiment of the release sheet with a polarizing plate of the present invention. FIG.
FIG. 2 is a sectional view of the release sheet with a polarizing plate of the present invention when cut in the direction a in FIG. 1. The release sheet 6 is not particularly limited as long as it has a release performance on the surface, but is usually composed of a substrate sheet whose surface has been subjected to a release treatment. Examples of the base sheet include various synthetic materials such as paper materials such as coated paper, glassine paper, and polyethylene laminated paper; polyolefins such as polypropylene; polyesters such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; polyvinyl chloride; A sheet of resin may be used. The base sheet may be a single layer or a multilayer of two or more layers of the same type or different types. The release sheet has a release agent layer formed by applying a release agent such as a silicone resin, an alkyd resin, or a silicone / alkyd resin to the surface of the base sheet. The thickness of the release sheet is not particularly limited, but is usually 20 to
It is sufficient if it is 500 μm, preferably 40 to 250 μm
It is.

The adhesive used for the adhesive layer 5 includes, for example, a rubber-based adhesive, an acrylic resin-based adhesive, a polyvinyl ether resin-based adhesive, a urethane resin-based adhesive, and a silicone resin-based adhesive. However, an acrylic resin-based adhesive is preferred. The thickness of the pressure-sensitive adhesive layer 5 is not particularly limited, but may be generally 10 to 100 μm, preferably 1 to 100 μm.
5 to 40 μm. The adhesive force of the pressure-sensitive adhesive layer 5 needs to be such that the polarizing plate can be stuck to the release sheet and the polarizing plate can be peeled off from the release sheet 6 and the adhesive force can be sufficiently adhered to the liquid crystal plate. Yes, usually preferably 1-5
0 N / 25 mm, particularly preferably 3 to 30 N / 2
The range is 5 mm. The adhesive strength in this case is JIS Z
It was measured according to 0237, and the adherend was glass.

The polarizing plate 2 has a polarizing axis in the direction in which the release sheet 6 is sent out, is usually rectangular, and has a polarizing axis in a substantially diagonal direction. Polarizing plate 2
Has polarization performance. Here, the polarized light means that the vibration direction of the vibration vector of the light wave is regular and its state, and includes elliptically polarized light, circularly polarized light, linearly polarized light and the like. The polarizing plate 2 may be made of a substance having a polarizing property. Usually, both surfaces of the polarizer are laminated with a protective film such as a triacetate film via an adhesive, and the surface is further protected with a protective film if necessary. Coated ones are mentioned. Examples of the polarizer include those obtained by dyeing a polyvinyl alcohol film with iodine or a dichroic dye and cross-linking with boric acid, and then uniaxially stretching the iodine or the dichroic dye so as to be oriented. Further, a viewing angle widening film or a reflecting plate film may be laminated on the polarizing plate 2 via an adhesive layer as needed. The size of the polarizing plate 2 may be appropriately selected according to the purpose of use.
Although there is no particular limitation, usually the length of one side is preferably 3 to 50 mm. The thickness of the polarizing plate 2 is not particularly limited.
00 to 300 μm is preferred.

A plurality of polarizing plates 2 are arranged on the surface of a release sheet 6 with an adhesive layer 5 interposed therebetween. In FIG. 1, an arrow A indicates a feeding direction of the release sheet 6, and an arrow B indicates
It shows the polarization axis of the polarizing plate 2, and the directions of the double arrows are coincident. In FIG. 1, four polarizing plates 2 are arranged diagonally in a row at a predetermined interval, and a large number of the rows are sequentially arranged at a predetermined interval. In addition, the number of the polarizing plates 2 arranged in an oblique line may be arbitrary and may be one. In addition, the predetermined interval between the polarizing plates 2 arranged in an oblique line may be arbitrary, and there may be no interval. Further, the predetermined interval between the diagonally aligned array of the polarizing plates 2 and the diagonally aligned array of the next polarizing plate 2 is:
It is optional and may not be spaced. The predetermined interval is
The smaller the number, the smaller the loss of the polarizing plate.

One side of the tip of the oblique line of the polarizing plate 2 has an angle of 10 ° with respect to the feeding direction (polarization axis direction) of the release sheet 6.
It is preferable that it is 80 degrees. In FIG. 2, on the surface of the release sheet 6 to which the polarizing plate 2 is not adhered, the remaining portion 3 of the polarizing sheet other than the polarizing plate 2 is removed. The adhesive may be present on the surface of the sheet 6 with the pressure-sensitive adhesive layer 5 interposed therebetween.
(See Fig. 3)

Next, a method for producing the release sheet with a polarizing plate of the present invention will be described with reference to FIG. FIG. 3 is a schematic sectional view showing a manufacturing apparatus used in one embodiment of the method for manufacturing a release sheet with a polarizing plate of the present invention. Release sheet 1 with polarizing sheet
Is a polarizing sheet 4 having a polarizing axis in the sending direction.
And a release sheet 6 having a pressure-sensitive adhesive layer 5 on the surface. The peeling sheet 1 with a polarizing sheet is cut by the die-cut blade 7 from the polarizing sheet 4 side to the upper surface of the peeling sheet 6 to form the polarizing plate 2 having a predetermined shape (hereinafter, referred to as a half cut). It is preferable to send out intermittently or continuously. As a means for sending out the release sheet 1 with the polarizing sheet, a sending-out roll 12 is cited. The delivery roll 12 is intermittently or continuously rotated by a delivery roll driving device (not shown), and can deliver the release sheet 1 with a polarizing sheet to the cutting device 13.

The release sheet 1 with a polarizing sheet is subjected to a half cut in which the polarizing sheet 4 and the pressure-sensitive adhesive layer 5 are cut by the die-cut blade 7 without cutting the release sheet 6. The die cutting blade 7 is fixed to a die cutting blade fixture 8. The die-cutting blade fixing device 8 can be moved up and down intermittently by a driving device (not shown). When the die-cutting blade 7 cuts into the release sheet 1 with a polarizing sheet, the pressing tool 9 is pressed from the back side of the release sheet 6. The half-cut can be applied to the release sheet 1 with the polarizing sheet pressed. The presser 9 can be moved up and down by a driving device (not shown). The die-cut blade 7 is not particularly limited as long as it can cut, and may be a type that moves up and down as shown in the figure, or a rotary blade that forms the die-cut blade 7 on the outer peripheral surface of the roll and rotates the roll. Type may be used. Further, the presser 9 may be in the form of a roll.

In FIG. 3, the die cutting blade 7
A cut 10 is made in the shape of the polarizing plate 2, but the remaining part 3 of the polarizing sheet other than the polarizing plate 2 and the pressure-sensitive adhesive layer 5 on the back surface thereof may be left on the surface of the release sheet 6 as it is.
It may be removed after the cut is completed. By the above method, the polarizing plate 2 can be formed on the release sheet 1 with a polarizing sheet, and the polarizing plate with an adhesive layer can be peeled.

Next, the peeling apparatus and the peeling method of the polarizing plate of the present invention will be described with reference to FIG. FIG. 4 is a schematic perspective view of an apparatus in which an example of the apparatus for manufacturing a release sheet with a polarizing plate of the present invention and an example of the apparatus for separating a polarizing plate of the present invention are combined. The release sheet with a polarizing sheet 1 pulled out from the raw material 11 of the release sheet with a polarizing sheet 1 is intermittently or continuously sent out to a cutting device 13 by a pair of sending rolls 12. This release sheet 1 with a polarizing sheet has a polarizing axis in the direction of arrow A. The release sheet 1 with a polarizing sheet is cut into a polarizing plate shape by a cutting device 13 to form a release sheet 6 with the polarizing plate 2 on which the polarizing plate 2 is formed. In FIG. 4, subsequently, the release sheet 6 with the polarizing plate 2 is sent out to the polarizing plate peeling tool 14, but before that, a take-up roll may be used. In this case, what is necessary is just to send out to the polarizing plate peeling tool 14 from another roll by another sending out means.

The release sheet 6 provided with the polarizing plate 2 on which the polarizing plate 2 is formed may have the remaining portion 3 of the polarizing sheet other than the polarizing plate 2 removed before reaching the polarizing plate peeling device 14, or may be left as it is. Good, but better to remove. The peeling sheet 6 with the polarizing plate 2 is wrapped around a polarizing plate peeling tool 14 provided on the side of the peeling sheet 6, and the polarizing plate 2 with the pressure-sensitive adhesive layer is peeled by the peeling action part 20 of the polarizing plate peeling tool 14. Then, the remaining release sheet 6 is taken up in the direction of arrow C by a take-up roll 15 that is driven intermittently or continuously by a driving device (not shown).

The peeling action portion 20 of the polarizing plate peeling tool 14 is disposed obliquely to the feeding direction of the peeling sheet 6 with the polarizing plate 2. The angle between the peeling action part 20 of the polarizing plate peeling tool 14 and the feeding direction of the peeling sheet 6 with the polarizing plate 2 is:
Preferably it is 10 to 80 degrees. In FIG. 4, four polarizing plates 2 are arranged diagonally in a row at a predetermined interval, and a large number of the rows are sequentially arranged at a predetermined interval. It is preferable that the angle of one row of the polarizing plate 2 and the angle of the peeling action portion of the polarizing plate peeling tool 14 coincide. By matching the angles of the two, the four polarizing plates 2 arranged obliquely in one row can be simultaneously peeled from the peeling action portion of the polarizing plate peeling tool 14. The polarizing plate peeling tool 14 is not particularly limited as long as it has a shape capable of peeling the polarizing plate, but the roll shape shown in FIG. 4 and the peeling action at the tip end as shown in FIG. A tapered shape, a flat plate shape, or the like toward the portion 20 may be used.

The polarizing plate 2 peeled off by the peeling action section 20 of the polarizing plate peeling tool 14 is adhered to the surface of a liquid crystal plate 17 which is adhered to a release sheet 16 at a predetermined interval by a pasting machine or the like. You. The release sheet 16 with the liquid crystal plate 17 is sequentially sent out from a supply device (not shown) so that the peeled polarizing plate 2 comes to a predetermined position on the surface of the liquid crystal plate 17.
It only has to be sent. In FIG. 4, since the four polarizing plates 2 arranged diagonally in a row are peeled off at the same time, the release sheet 16 with the liquid crystal plate 17 is taken over on the surface of the release sheet 16 with the liquid crystal plate 17. Four liquid crystal plates 17 are stuck and arranged in a direction substantially perpendicular to the direction (the direction of arrow D). As described above, the number of the liquid crystal plates 17 may be selected according to the number of the polarizing plates 2 that are simultaneously peeled.

Release sheet 1 with polarizing plate-coated liquid crystal plate 18
6 is attached in the direction of arrow D after its surface is adhered with the polarizing plate 2. After the peeled polarizing plate 2 is adhered to the surface of the liquid crystal plate 17, in order to secure the adhesion between the liquid crystal plate 17 and the polarizing plate 2, a pressing tool such as a pressing roll (not shown) is used. It may be pressed. The release sheet with a polarizing plate of the present invention is used for a projector LCD and a camcorder LC.
D. It can be used for efficient sticking work to the surface of a small or ultra-small liquid crystal plate such as a mobile phone LCD.

[0020]

Examples of the present invention will be described below. Note that the present invention is not limited by this example. Embodiment 1 An embodiment of the present invention will be described with reference to FIGS. Polyethylene terephthalate sheet (thickness 100 μm, width 6)
A pressure-sensitive adhesive layer 5 (thickness 2) made of an acrylic resin-based pressure-sensitive adhesive is formed on the release-treated surface of a release sheet 6 that has been subjected to a release treatment made of a silicone resin on a surface having a thickness of 0 mm and a length of 100 m.
A polarizing sheet 4 (thickness: 100 μm, width: 60 mm, length: 100 m) having a polarizing axis in the length direction (the direction in which the release sheet is fed out) is laminated via 5 μm and an adhesive force to glass of 15 N / 25 mm. A release sheet 1 was prepared. Next, using the apparatus shown in FIG. 4, the release sheet 1 with the polarizing sheet is fed out by a feed roll, and the die cutting blade 7 (the height of the blade is 150 μm) by the cutting device 13.
Is made to reach the upper surface of the release sheet 6 from the polarizing sheet 4 side, as shown in FIG.
The polarizing plates 2 (rectangular, 8 mm long, 14 mm wide) having a polarizing axis in the direction in which the release sheet 6 is sent out are arranged in a row in an oblique manner.
The four polarizing plates 2 are arranged at an interval of 4 mm, and the four polarizing plates 2 in an oblique line form a release sheet with a polarizing plate sequentially arranged at an interval of 8 mm in the feeding direction of the release sheet 6.

The angle of the edge of the front end of one row of the polarizing plate 2 with respect to the feeding direction of the release sheet 6 is 60 degrees. Subsequently, the remaining part 3 of the polarizing sheet is removed, and the peeling sheet 6 side of the peeling sheet with a polarizing plate is wrapped around an aluminum cylindrical roll polarizing sheet peeling tool 14 having a diameter of 10 mm and a length of 100 mm, and the end of the peeling sheet 6 is wound. It was set on the take-up roll 15 and winding and feeding were started at a speed of 5 m / min. In addition, the cylindrical roll-shaped polarizing plate peeling device 14 is arranged so as to be at an angle of 60 degrees with respect to the feeding direction of the peeling sheet with the polarizing plate. The four polarizing plates 2 in a diagonal line were simultaneously peeled off obliquely by the cylindrical roll-shaped polarizing plate peeling device 14 at an angle of 60 degrees with respect to the feeding direction of the peeling sheet with the polarizing plate.

[0022]

The release sheet with a polarizing plate of the present invention can be manufactured efficiently and can be used for an efficient work of attaching a polarizing plate to the surface of a liquid crystal plate. INDUSTRIAL APPLICABILITY The polarizing plate peeling method and the polarizing plate peeling device of the present invention can be used for an efficient operation of attaching a polarizing plate to the surface of a liquid crystal plate.

[Brief description of the drawings]

FIG. 1 is a plan view showing a release sheet with a polarizing plate according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a release sheet with a polarizing plate according to one embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a manufacturing apparatus used in an embodiment of the method for manufacturing a release sheet with a polarizing plate of the present invention.

FIG. 4 is a schematic perspective view of an apparatus obtained by combining an example of an apparatus for manufacturing a release sheet with a polarizing plate of the present invention and an example of an apparatus for separating a polarizing plate of the present invention.

FIG. 5 is a perspective view showing a specific example of a polarizing plate peeling tool used in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Release sheet with polarizing sheet 2 Polarizing plate 3 Remaining polarizing sheet 4 Polarizing sheet 5 Adhesive layer 6 Release sheet 7 Die-cut blade 8 Die-cut blade fixing tool 9 Holding tool 10 Cut 11 Raw material of release sheet with polarizing sheet 12 Sending roll 13 Cut Apparatus 14 Stripper for polarizing plate 15 Winding roll 16 Release sheet 17 Liquid crystal plate 18 Liquid crystal coated with polarizing plate 20 Stripping section

Claims (4)

[Claims] 1. A release sheet with a polarizing plate, wherein individual polarizers having a polarization axis in a feeding direction of the release sheet are adhered and arranged on a surface of the release sheet by an adhesive layer. 2. A release sheet provided with a pressure-sensitive adhesive layer and a release sheet sequentially laminated on one side of a polarizing sheet having a polarization axis in a feeding direction is cut into a predetermined shape from the polarizing sheet side to the release sheet upper surface. A method for producing a release sheet with a polarizing plate, comprising: preparing a polarizing plate with an adhesive layer. 3. A method for sending out the release sheet with a polarizing plate according to claim 1, and peeling the polarizing plate with an adhesive layer from the release sheet with a polarizing plate, wherein the polarizing plate with an adhesive layer is peeled off with the release sheet with a polarizing plate. Separating the polarizing plate in a direction oblique to the feeding direction of the polarizing plate. 4. A peeling sheet with a polarizing plate, means for feeding a peeling sheet with a polarizing plate, a polarizing plate peeling tool provided on the peeling sheet side of the peeling sheet with a polarizing plate, and means for taking off the peeling sheet, wherein the peeling action portion of the polarizing plate peeling tool is polarized. A peeling device for a polarizing plate, which is disposed obliquely to a feeding direction of a peeling sheet with a plate.